Andy Murray withdraws due to injury

Olympic champion Andy Murray was forced to withdraw from the Toronto Masters on Thursday with a knee injury, sending Canadian Milos Raonic into the quarter-finals of his home event.

Murray, who won a struggling second-round match on Wednesday after arriving in Canada on Tuesday from his gold-medal performance at the London Games, was treated for the knee during his victory over Italian Flavio Cipolla.

The withdrawal came on a day of rain which prevented the start of third-round play with all seven remaining matches finally cancelled in the evening and more bad weather forecast for Friday.

Murray, twice a champion in Canada, will hope to be fit for a title defence starting next week in Cincinnati, the last major tune-up before the August 27 start of the US Open.

"I decided this morning," said Murray. "It was a bit sore yesterday. I came in today, saw the physios, they did some work on it, and it's still a bit sore.

"I did a little warm up on the bike to try it out and it was still sore. I had to make a decision as to what I was going to do.

"I spoke with the guys and decided the best thing was to rest and try and make sure I can actually let my body kind of adjust to the surface."

Murray said that with his travelling physio on hand, he feels he has a chance to be fit before the Cincinnati start.

"I'll be able to get as much treatment as possible. I wasn't able to to do anything to adjust to the surface (from Olympic grass) and get used to the movement at all.

"I'll be able to do that and give it a few days and see how it feels.

"The hard courts, for me anyway, are the hardest on my body. It always takes me a bit of time to get used to playing on them again. I hope it doesn't affect the next few weeks too much.

"Now I have to take a couple days off without playing, so this (injury) may have set me back slightly."

The Murray withdrawal made 16th seed Raonic the first Canadian into the last eight since Frank Dancevic faced Rafael Nadal five years ago.

Meanwhile at the WTA Montreal tournament former word number one Ana Ivanovic suffered a humiliating 6-0, 6-0 loss to Roberta Vinci.

Vinci needed just 44 minutes to oust the 11th seeded Ivanovic, who had three game points in the match but never converted.

Ivanovic had game point serving at 0-4 in the first set and two more serving 0-2 in the second. It was her the first time she has lost a match on the WTA tour without winning a single game.

"I really struggled to find my rhythm out there," the Serb said. "It came as a surprise a little bit because I was practising really well.

"I was struggling to find my feet and get two consecutive balls in the court. Against players like Roberta who don't make many errors, it's always going to be tough to win like that.

"When you're down 4-0, 5-0, 6-0, the panic starts to set in. I forced a little bit. It was bad already without that. It was really, really tough for me out there."

Vinci did not expect such an easy victory. She came from behind to beat Yanina Wickmayer in the first round.

"It's not easy to win 6-0, 6-0 against a great player like Ana," Vinci said.

"I was playing really consistently with a lot of slice - and she doesn't like my slice. I think that was the key. I've played against her a lot of times, and it was strange to play her when she was playing like this."